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Changelog State API – LangChain Change History
x402
Changelog State API – LangChain Change History is a paid API for AI agents from changelog-state-api.replit.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Returns detected changelog update history (new releases, version changes, breaking signals, etc.) for the LangChain vendor.
Price / call$0.01
Success—
StatusUnknown
How this service works
Detected changelog update history for one tracked vendor.
Output
A JSON array of detected changelog change records for LangChain, each including the change type (e.g. new_release, version_changed, breaking_signal), detection timestamp, and relevant metadata about what changed. Supports filtering by change type and time window.
Example use cases
Breaking change alert for LangChain
“Have there been any breaking changes detected in LangChain's changelog in the past 30 days? Show me up to 50 results.”
Track LangChain releases for dependency updates
“List all new_release events detected for LangChain since January 1st, 2025 — I need to know when to update our dependency.”
Daily changelog diff for LangChain
“Pull me today's changelog update history for LangChain — anything detected since midnight UTC, all change types, up to 20 entries.”
Technical details
Endpoint
GEThttps://changelog-state-api.replit.app/api/monitors/langchain/changesWhen to prefer
Use this endpoint when you need a history of detected changelog mutations for LangChain specifically — including breaking signals, version bumps, and release events — with time-range and type filtering. Prefer this over the 'structured recent releases' sibling endpoint when you need raw change detection events rather than curated release summaries, or when you want to audit changelog mutations over time.
Side effects
- Invalid slug format returns 400 (must be lowercase alphanumeric with dashes)
- Untracked vendor slug returns 404 or empty results
- since timestamp in wrong format (not ISO 8601) returns 400
- limit exceeding 200 returns 400 validation error
- Insufficient payment or failed x402 payment returns 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object | Detected changelog update history (paid) |
Tags
x402
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